An artifact from J. R. R. Tolkien
universe of Middle-earth
was an Elvish
knife made in Gondolin
in the First Age
. It was used as a sword by Bilbo
, who found it in a troll
-hoard together with Glamdring
. Bilbo gave Sting to Frodo
, just before the Fellowship of the Ring
set off from Rivendell
It has the magic ablilty to detect an orc presence near it. When this presence is felt, it glows blue, as it did before the fight in the mines of Moria when the orcs attacked the Fellowship.
Gollum is afraid of Sting. This fear helped Bilbo when confronting Gollum under the mountain in The Hobbit. It also helped Frodo tame Gollum (temporarily) in The Lord of the Rings.